Triboelectric Nanogenerator And Self-powered Sensor Based On Self-healing Materials

With the continuous progress of science,society and technology and the emergence of the Internet,there are more and more portable electronic products and devices in people’s lives,and the number is still growing rapidly.Portable electronic products have the characteristics of wide distribution and large number.As one of the most important human-machine interaction interfaces,touch sensors have been widely used in various portable electronic devices such as smart phones,tablet computers,smart watches and so on.The battery pre-charging power supply mode is the main energy supply mode for portable electronic devices.This supply mode has a series of problems such as: poor durability,serious pollution to the environment,regular replacement,etc.These problems greatly limit the further application and promotion of this power supply mode.Therefore,it is very valuable to explore a method that can convert mechanical energy in the environment into electrical energy.The triboelectric nanogenerator was proposed under this background.Although the general friction nanogenerator can be self-powered,it may be squeezed or rubbed during use.Especially the friction nanogenerator made of hard materials will damage the friction electrode,affect the use or make its performance sharp.Therefore,a large number of researchers have designed and produced flexible nanogenerators that can heal themselves.In this paper,a simple method was used to prepare a healable elastomer composed of glycerin and hydroxyethyl cellulose(GHEC).A single-pot polymerization method was used to prepare a double-network(DN)hydrogel composed of acrylamide and carrageenan.The elastomer envelops the hydrogel to prepare a single-electrode triboelectric nanogenerator with a sandwich structure.The glycerol hydroxyethyl cellulose elastomer is used as the friction layer in the friction nanogenerator,and the hydrogel with the double network structure is used as the conductive layer in the friction nanogenerator.Characterization of tribo nanogenerators.The power generation principle of the triboelectric nanogenerator is analyzed,and the finite element simulation is performed on the four typical electric potentials in the periodic contact separation of the triboelectric nanogenerator with COMSOL software.After some tests,it has been shown that the friction nanogenerator made of healable materials can make different responses to different vibration frequencies and different contact friction materials;the data show shows that the friction nanogenerator is stable,and it is stable before and after self-healing.The electrical output change is not too large.The transparency of the self-healing and self-powered Triboelectric nanogenerator(SSTENG)is very high.A self-powered sensor based on the triboelectric nanogenerator is designed.The sensor is composed of nine basic units,which can be driven by the hand.The basic unit can generate electrical signals,and the self-powered sensor that does not require continuous power supply from an external power supply provides the possibility to be used as a self-powered screen sensor.